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Strange clutch issues (PICS)

General Tech Talk

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Posts: 18
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Strange clutch issues (PICS)

Post by benmgsr »

Below are some photos of my clutch that i pulled out of my '86 Landcruiser BJ74.
The clutch has always been funny (activated at about 1 inch from the floor). I have replaced the master cylinder and the slave cylinder to no avail.
So i pulled the gearbox (off for a rebuild) and found this:

Image

Image

Notice the wear on the fingers of the clutch plate >>>>
Image

And the wear mark on the clutch disk >>>>>
Image

And the broken spring(s) here >>>>
Image

What does this tell you? incorrect installation?
It appears the thrust bearing has been sitting on the clutch plate wearing it out, and then possibly pushing in to far? pushing the fingers onto the clutch disk?
Would this explain the way my clutch pedal felt?

Also, while pulling the gearbox, i found various random bolts in places and some missing from the bellhousing etc. Looks like there has been recent work done...
Does it look like it has the correct clutch release fork?

Thanks guys
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Post by coxy321 »

Is the thrust bearing seized? Possibly the wrong clutch plate, hence the pressure plate fingers touching down onto the clutch plate.

Was the actual clutch working ok, aside from the weird action?
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Post by benmgsr »

Yep, the clutch was working and didn't appear to be slipping or anything...

The thrust bearing is fine

Apart from the damage, it all looks in pretty good nick, still plenty of meat on the disc etc.

I have a new clutch kit, the plate looks the same as the new one.
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Post by popeyehj60 »

is this with the factory gearbox or has it been changed out


ive had this issue but i overcame mine by backing off the slave cylinder rod
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Post by bazzle »

Pressure plate looks pretty normal to me for one with a few k's on it.

I would suspect either a bent (or flexing) thow out fork or the slave cylinder rod need sizing to the app.

Bazzle
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Post by MrGrim »

pressure plate fingers is normal wear..

wear mark on disc is due to slave over throwing the thrust bearing
( cause incorrect adjustment of master rod to pedal and also slave rod )

the broken spring this is just a case of :bad-words: happens
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Post by BadMav »

Someone may have put the clutch plate in back to front. Could explain the broken springs too.
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Re: Strange clutch issues (PICS)

Post by benmgsr »

Gday all,

The Thrust bearing was fine, replaced it though.

I have just finished re-installing the gearbox and new clutch, it all went together pretty well.

I have an issue though, when i put the slave cylinder on, it automatically pushes hard on the fork, therefore pushing the thrust bearing hard up against the clutch plate fingers already.

I have checked to see if it is the right one, and it does appear to be (according to the online EPC) (SEE PICS BELOW)

I looks like it's all stock, but i dont like the way it pushes up and there appears to be no adjustment on the rod or anything.

Opinions? Ideas? Is this the same for others?

Thanks

Image
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Re: Strange clutch issues (PICS)

Post by bru21 »

Sometimes the slave comes with 2 rods of different lengths.
I have trimmed them down in the past too.

Just make sure its all good first!
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Re: Strange clutch issues (PICS)

Post by MrGrim »

the only adjust ment you have is on the push rod ..pedal to master
71 fj40 front shackle reversal +3" , 55 rear springs +3", 35 15.5 claws , 60 diff's 4wheel disc's , SOON TO BE WINDSOR V8 + 5 speed
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Re: Strange clutch issues (PICS)

Post by hulsty »

did you install your new booster? there is adjustment between the booster and master cylinder.
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Re: Strange clutch issues (PICS)

Post by mavzilla »

it is hydraulicly adjusted and that is standard the way you describe it, as long as you can push in the slave cylinder rod when in place a little
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Re: Strange clutch issues (PICS)

Post by the gun »

MrGrim wrote:the only adjust ment you have is on the push rod ..pedal to master
This is correct, how ever you should have some free play between the slave cylinder and the clutch fork. What I mean by this is that the slave cyl should not be bottomed out in its at rest state.
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Re: Strange clutch issues (PICS)

Post by benmgsr »

It isn't bottomed out...

Ill finish putting it all together and bleed it all out and see how it is.\

Thanks
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